Locals celebrate new Diamond Bar 60 Freeway off-ramp at one of the worst bottlenecks on West Coast

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A Caltrans truck parked at the start of the new on-ramp is pictured during the opening ceremony of the SR-60 westbound Grand Avenue on-ramp in Diamond Bar, Calif. on Wednesday October 10, 2018. (Photo by Raul Romero Jr, Contributing Photographer)

The combined portion of the two major freeways causes motorists to weave across traffic lanes to catch the 60 westbound or the 57 southbound and vice versa, as 16 lanes squeeze into 12. The 57/60 bottleneck is used by 356,000 vehicles a day or about 100 million vehicles a year, according to project engineers.

A car drives by the new on-ramp before the start of the opening ceremony of the SR-60 westbound Grand Avenue on-ramp in Diamond Bar, Calif. on Wednesday October 10, 2018. (Photo by Raul Romero Jr, Contributing Photographer)

The ceremonial semi-truck to first use the new on-ramp is pictured during the opening ceremony of the SR-60 westbound Grand Avenue on-ramp in Diamond Bar, Calif. on Wednesday October 10, 2018. (Photo by Raul Romero Jr, Contributing Photographer)

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Two Caltrans workers walk next to the ceremonial semi-truck to first use the new on-ramp during opening ceremony of the SR-60 westbound Grand Avenue on-ramp in Diamond Bar, Calif. on Wednesday October 10, 2018. (Photo by Raul Romero Jr, Contributing Photographer)

Diamond Bar city manager Dan Fox (left) and council member Steve Tye pose for a portrait during the opening ceremony of the SR-60 westbound Grand Avenue on-ramp in Diamond Bar, Calif. on Wednesday October 10, 2018. (Photo by Raul Romero Jr, Contributing Photographer)

From left, Caltrans’ Mark Archuleta, City of Industry council member Catherine Marcucci, city manager Troy Helling, Mayor Mark Radecki, Mayor Pro Tem Cory Moss, Diamond Bar council member Steve Tye, Mayor Pro Tem Carol Herrera, council member Jimmy Lin and city manager Dan Fox hold an honorary ribbon as its is cut during the opening ceremony of the SR-60 westbound Grand Avenue on-ramp in Diamond Bar, Calif. on Wednesday October 10, 2018. (Photo by Raul Romero Jr, Contributing Photographer)

A Golden State Food truck driven by Randy Reza breaks a ceremonial banner during the opening ceremony of the SR-60 westbound Grand Avenue on-ramp in Diamond Bar, Calif. on Wednesday October 10, 2018. (Photo by Raul Romero Jr, Contributing Photographer)

City of Industry council member Catherine Marcucci, Mayor Pro Tem Cory Moss, Golden State Food driver Randy Reza and Mayor Mark Radecki pose for a portrait during the opening ceremony of the SR-60 westbound Grand Avenue on-ramp in Diamond Bar, Calif. on Wednesday October 10, 2018. (Photo by Raul Romero Jr, Contributing Photographer)

Caltrans as well as City of Industry and Diamond Bar representatives gather at the bottom of the on-ramp during the opening ceremony of the SR-60 westbound Grand Avenue on-ramp in Diamond Bar, Calif. on Wednesday October 10, 2018. (Photo by Raul Romero Jr, Contributing Photographer)

The new on-ramp is pictured during the opening ceremony of the SR-60 westbound Grand Avenue on-ramp in Diamond Bar, Calif. on Wednesday October 10, 2018. (Photo by Raul Romero Jr, Contributing Photographer)

A sign for the new on-ramp is pictured during the opening ceremony of the SR-60 westbound Grand Avenue on-ramp in Diamond Bar, Calif. on Wednesday October 10, 2018. (Photo by Raul Romero Jr, Contributing Photographer)

The new on-ramp is pictured during the opening ceremony of the SR-60 westbound Grand Avenue on-ramp in Diamond Bar, Calif. on Wednesday October 10, 2018. (Photo by Raul Romero Jr, Contributing Photographer)

A Caltrans truck parked at the start of the new on-ramp is pictured during the opening ceremony of the SR-60 westbound Grand Avenue on-ramp in Diamond Bar, Calif. on Wednesday October 10, 2018. (Photo by Raul Romero Jr, Contributing Photographer)

Christopher Yee is a reporter for the Pasadena Star-News and San Gabriel Valley Tribune covering cities in the west and central parts of the San Gabriel Valley. He grew up in Monterey Park and studied journalism at East Los Angeles College and UC Berkeley. You may find him at Dodger Stadium or at the Staples Center for L.A. Kings games.